Electrostatic spraying device and method using an alternating po

Details Electrostatic spraying device and method using an alternating po Electrostatic spraying device and method using an alternating po

1991-07-25

1993-06-29

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Processes

Including electrostatic charging

239690, 239691, B05B 5053, B05B 516

Patent

active

052226638

ABSTRACT:
An electrostatic spraying device in which liquid emerging from an outlet of the device nozzle (12) is subjected to an electrical field sufficiently high for the liquid to be drawn from the outlet as one or more ligaments which break up into charged droplets to form the spray. The device is adapted for the spraying of targets which are conventionally difficult to coat electrostatically, eg. targets of insulating material. This is achieved by the use of circuitry (18, 20, 22, 24) which generates a bi-polar high voltage output having a frequency such that successive clouds of particles are charged with opposite polarity but do not discharge each other in flight. In this way, the charge applied to the particles is effective to assist seeking of the target without leading to build-up of charge on the target.

REFERENCES:
patent: 1958406 (1934-05-01), Darrah
patent: 4336275 (1982-06-01), Scholes
patent: 4343828 (1982-08-01), Smead et al.
patent: 4462061 (1984-07-01), Mommsen
patent: 4549243 (1985-10-01), Owen et al.
patent: 4703891 (1987-11-01), Jackson et al.
patent: 4737887 (1988-04-01), Thome
patent: 5032422 (1991-07-01), Lamirand et al.

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